In this thread we share with favorite questions of ours.
Here is one of mine: Suppose two players A and B, play a series of games as follow: Three fair coins are tossed simultaneously. B is the banker; he recieves $5 from A for each game and he pays $3 for each heads that appears. What average amount per game will A win if he plays this many times? That is what is the expected value in money of a game to a A?

This question is related to mean. Author: Norman Draper "Probability: an introductory course" University of Wisconsin.